docs: def _buildTemplates(self):
          """
          OVERRIDING THIS METHOD from Factory
          """
  
          jsontree_classes = build_D3treeStandard(
              0, 99, 1, self.ontospy_graph.toplayer_classes)
          c_total = len(self.ontospy_graph.all_classes)
  
          JSON_DATA_CLASSES = json.dumps({
              'children': jsontree_classes,
              'name': 'owl:Thing',
          })
  
          extra_context = {
              "ontograph": self.ontospy_graph,
              "TOTAL_CLASSES": c_total,
              'JSON_DATA_CLASSES': JSON_DATA_CLASSES,
          }
  
          # Ontology - MAIN PAGE
          contents = self._renderTemplate(
              "d3/d3_rotatingCluster.html", extraContext=extra_context)
          FILE_NAME = "index.html"
          main_url = self._save2File(contents, FILE_NAME, self.output_path)
  
          return main_url